Tire Sizing & Ratings - All Makes & Models

Tire Sizing & Ratings - All Makes & Models

Proper service and repair procedures are vital to the safe, reliable operation of all motor vehicles as well as the personal safety of those performing the repairs. Standard safety procedures and precautions (including use of safety goggles and proper tools and equipment) should be followed at all times to eliminate the possibility of personal injury or improper service which could damage the vehicle or compromise its safety.

INTRODUCTION

R TIRE SIZING & RATINGS - ALL MAKES & MODELS

BASIC SKILLS REQUIRED

SOME EXPERIENCE RECOMMENDED

ADVANCED SKILLS & EXPERIENCE REQUIRED

PROFESSIONAL SKILLS & SPECIALTY TOOLS REQUIRED

This PDF has been created for informational purposes to help answer any questions you might have on tire sizing and ratings (Passenger Car tires only). After reading this PDF you will understand:

* What is printed on the sidewall of a tire * How to quickly read and understand tire ratings * How to determine the speed and load ratings of a tire * How to use all of this knowledge to find the appropriate tire to fit your needs and your vehicle

TABLE OF CONTENTS

Installation Notes...........................................................................................................pg.3 Preparation And Safety................................................................................................pg.3 What's On Your Sidewall?............................................................................................pg.4 How To Read The Sidewall Of A Tire........................................................................pg.5 Load Index Ratings........................................................................................................pg.10 Speed Ratings..................................................................................................................pg.10

ECS TUNING 1000 SEVILLE RD. WADSWORTH, OH 44281 1.800.924.5172 WWW.

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R TIRE SIZING & RATINGS - ALL MAKES & MODELS

WHAT'S ON YOUR SIDEWALL?

Aspect Ratio

Tire Construction

Wheel Diameter

Tire Width Tire Type

25/40R18

Load Index

P2

93W

Speed Rating

TTREADW

Temperature Grade

RATURENDA

EAR 800 TRACTION A TEMPE IRE BRA

Traction Grade

Treadwear Grade

ECS TUNING 1000 SEVILLE RD. WADSWORTH, OH 44281 1.800.924.5172 WWW.

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R TIRE SIZING & RATINGS - ALL MAKES & MODELS

HOW TO READ THE SIDEWALL OF A TIRE

Tire Type:

The letter "P" at the beginning of the tire code tells us that this is a tire which is made to the required specifications to be used on passenger cars in the United States. Other examples of tire types include "LT" for Light Truck tires, "ST" for Special Trailer, and "T" for Temporary tires (more commonly known as "donut" or "space saver" spare tires.

Tire Width: The three-digit number following the tire type code is the width of the tire measured in millimeters from sidewall to sidewall. The tire in the example has a width of 225mm.

TECH TIP You can convert the width measurement from millimeters to inches by dividing the width by 25.4. For example: 225mm / 25.4 = 8.86"

ECS TUNING 1000 SEVILLE RD. WADSWORTH, OH 44281 1.800.924.5172 WWW.

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R TIRE SIZING & RATINGS - ALL MAKES & MODELS

HOW TO READ THE SIDEWALL OF A TIRE

Aspect Ratio: The two-digit code following the slash mark is the aspect ratio of the tire. This number represents the relationship between the width of the tire and the height of the sidewall. For example: The tire shown has a width of 225mm, and the aspect ratio is 40%. To calculate the height of the sidewall we multiply the width by the aspect ratio: 225 x 40% (0.40) = 90mm.

TECH TIP You can convert the sidewall height from millimeters to inches by dividing the height by 25.4. For example: 90mm / 25.4 = 3.54"

Tire Construction: The letter code following the aspect ratio identifies the tire's internal construction. In our example, we see the letter "R", which means this tire has a Radial construction. Radial tires are the most popular type of tire sold today representing over 90% of all tires sold.

ECS TUNING 1000 SEVILLE RD. WADSWORTH, OH 44281 1.800.924.5172 WWW.

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